Mechanical stoker



J. A, PACKARD MECHANICAL STOKER March 10, 1925.

, 1921 4 Sheets-Sheet 1.

Filed Jan 24 WITNESSES J, A. PACKARD MECHANICAL STOKER Fna Jan. 24. 1921 4 sheets-sheet 2 Marh 10; r925. 1,529,269

WITNESSES I "i291? ATTO W pfi/M March '10. 1925.

J. A. PACKARD I MECHANICAL STOKER Filed Jan. 24. 1 921 4 Sheets-Sheet 3 jfi w 69(2/4 I 4 -Sh ets-She et 4 J. A. PACKARD uEcHANicAp STOKER Filed Jan. 24, 1921 mm On 4 w am 1 Am mm mm Hm mu .w N Mn a. L w @H H mu w m@ x B E 0 an 7 [MW m March 10, 1925.

IN TOR- I mfifl Patented Mar. 10, 1925. I1

UNITED STATES, PA -Eur ()VFFICAEQI.

JAMES A. eans, or MILWAUKEE, wrs'oonsrn, nssrenoa To rncxaan'sroxna CORPORATION or AMERICA,'OF MILWAUKEE, WISCONSIN, A conronamron or 1 WISCONSIN.

MECHANICAL sTo'KnRE 10 The invention relates to mechanical stokers, more particularly for boilers and having inclined grates over'which the fuel during the process of combustion. Y One of the important objects of this inlo vention is the gradual downward feed of the coal upon the grate bars without turning the burning fuel.

A further object of theinvention is to provide feed slides moving in an opposite direction from that of the grates and overlapping the upper portion of the grates to advance the material onto and along the grates.

A further object of the invention is to provide mechanism for discharging the ash into 25 the ash pit and toprevent the coke on the lower ends of the moving grates from falling into theash pit.

A further object is to provide for'ready renewal of-those parts of the grate which may need replacement.

A further object of the invention is to provide a simple and efficient adjustable driving mechanismrforthe moving parts.

The invention further consists in the several features hereinafter described and more particularly defined byclaimsat the conclusion hereof.

In the drawings: Fig. 1 is a side elevation of a stoker embodying the invention, part of the driving mechanism being removed; Fig. 2 is a front end view of the stoker, parts heingbroken away; Fig. 3 is a plan view of one-half of the stoker; Fig. 4 is a section taken on the line 44 of Fig. 3; Fig. 5 is a detail view of the drive mechanism; Fig. 6 is a section through one of the grate bars on line 6-6 of Fig.4. 2 f V The frame oft-he stoker comprises front columns 7 ,rear columns 8 andinclined side framemembers 9 supported by these columns. The frame members 9 are provided with upstanding spaced lugs 10 forming passes supports for hollow metaLblocks' 11 provided with recesses 12 to receive the lugs and forming a siding forthe grates. A transverse frame member 13 connects'the lower ends of'the members 9; together and has hollow. liningblocks 14' mounted thereon in a manner similar to the mounting of the blocks 11 on the lugs 10. A front plate 15 connects the columns 7 togeth'erl: 'A'bottom plate :16

forms the floor of the ash pit 17. The lin ing blocks may bereadily renewed, necessary. V.

Apair of doors 19 are hingedly connected to each of the end columns .7 and'extendover to the center column and are adapted to be opened :to provide axnatura'l draft.- Where suchdraft'is not sufficient for the proper combustion of the fuelv the hollowjcolumns -7 form conduits 20 which maybe connected at their lower ends 21 to aforced draft sup,- ply (not shown); 5 The grates are arranged. between the end and "middle side frame-members 9, one set of grates being shown in Fig. 3. Each set'of grates includes an :inclined reciprocating grate consisting of a plurality of grate bars 22 of step formation, having slots 23extendingthrough the steps'a'nd tapered, as shown in Fig. 6, to form narrowopenings at the top so as to prevent the fuel falling through.

The lower ends24'ofthese grate bars are formed separately .fromthe remainderiia'nd arebolted to the main portions of said. bars so that said ends m'ay be readily renewed if they burn joutfi" i 7 p Transversely disposed shafts 25 and 26 are secured to the frame members 9 and carry a plurality of sets of rollers 27 uponwhich the depending flanges 28 ofeach grate bar ride as Saidbars'are reciprocated upon the inclined supporting frame. The lower ends of the movable 1 grate bars 22 slide-upon a fixed slotted grate bar 29.

Each grate bar 22 has a depending arm 30 from one step to another down' lthe inclined The shaft 33'carries a segmental gear34 fio eprovided ":between each, -'slidei: and the through a ratchet feedgfshowning Fig;

This feed includes a ratchet Wheel 43 on the-shaft .42, ac feed i pawl f 44 mounted :OI) ani' arlni hotloosely -mounted atr'one endTupon the-shaft- 42.?anfl thaving ;a'-'slot 46; aired? centficjhd d? *p'fi'SSillfg through saidislot- V426 and provided with; a piII'r'48 'engageah'le with said arm'c45 to move the pawl-fan eccntric V 'sfraiie to.whichiosaidrod'it'i connected, T

tfildilalii eccentric f50 ii1ohnted upon a dliVil iiadjustab le stop' 52 "on a stattionary bracket" 53" "limits *the loii'vermost the stroke thereof imparted to it'fIfOIIPLfthQ 25 f'loosetro'd 47' tsozi'tliatrtlie pawlv 44 turnsthe shaft: fe2 tli'rou "h -'ai 'g'reateri or; less iangl-e Tingjpawl'f53'ngagingzthe ratchet. Thetpa rt 3950f the two-partPCOnITeCting'frOdabove ing. the flower "bolt: "5 irth'exidrive' from ithc f v shaft 42 is disconnected as i thekpartsifi ahd ;v n

carries-"a igeari 55 ineshing:awithzarfgeari 55 "uponashaft 5'71 carry'ingea pulley-58 adaptt ed to *he gconncted "by belt to anyesuitabie pnimeifiioveri. A i

, V is. r. i a 'F r .i each set "of tinclined, rinovable ate hairs 122' forming a" single incline-d gra e a feed slide 5918 proVidedL- These slides for n the ribottoin-of a-fed T'hopperftii), forueach fs'feft of grate bars, a discharge opening 61 b ing: rear gwaii 6230f each hoppen': Each; slid laps at the forward portion :thekseto new ,-oharges pushing the older charges tweeter? .;'ends-of-said "-barsi'and provided with racks 22 Without turning the fuel. This action k eepsthe burning fuel in motion as itopasses gofvslrii' tlie grate bars 2 2Without turning the ue 'V he" the fuelreaches the lo 2: grew and is duinped "into theash dumping ash grates 65* grl'itehdis pivotally mounted at 67 near itsgear end a n d tigs downwardly, as shown in Fig. 4. The grate 66 is pivotally mount ed at 69 near its a d f iP=- P.W 2 lyia esh i n in;-+E -J ,..1.i irontffe :7 w iz. apps;jrefltiontfirmin 21;.. t0p .tosp ea fi eldoesgt e lowe h ads 11d -,22; 2me a1lifi 'ih 9 t1 ii smqiz ment o Peda 1 e en t9 ri ed-p e i. ectic i PQ ji P ebe 171mm 11 pit 'ie e i v a. l v r;- 68uwll hr s PAY "14111:, .M ,FA "2) form or 'arrangement 'of a ts eXcep,

tara s such limitations are .specified vin the J13 o Whales fa's. le gm g 1,-' .JIn stoli'e the co movable1 1E) Ta id 'i'lln'cline jaar llel ing the grate and feed shdeinopposite'direcl g, v Y 7 ii i foke a i lir r i sei ii ha of lower end of said stepped grate moves, a feed slide movable parallel to and overlapping the upper end of the stepped grate, means moving the stepped grate and feed slide in opposite directions, and a hopper supplying fuel to said feed slide.

3. In a stoker, the combination of a reciprocating stepped grate disposed on an incline, a feed slide movable on an incline parallel to the line of movement of the grate and overlapping said grate, means for moving the grate and feed slide in opposite directions, and means for supplying fuel to the feed slide.

4:. In a stoker, the combination of a reciprocating stepped grate disposed on an incline, a feed slide disposed on a similar incline and overlapping said grate, a rock shaft, connections between said grate and 2 shaft'and between said slide and shaftfor moving the grate and feed slide in opposite directions, and means for rocking said shaft.

5. In a stoker, the combination of an inclined supporting frame, transverse shafts mounted on said frame at different elevations, rollers mounted on said shafts, a stepped grate bar mounted on said rollers and movable up and down on an incline; a hopper, a feed slide at the bottom of said hopper and overlapping the upper end of said bar, and means vfor moving said grate bar and feed slide in opposite directions comprising a rack on said feed slide, a rock shaft, a gear on said rock shaft meshing with said rack, an arm' on said rock shaft, and a link connecting said arm withfsaid grate bar.

In testimony whereof I aflix my signature.

J ARIES A. PACKARD. 

